const fs=require('fs');
try{
    fs.open('./input.txt','w+',(err,fd)=>{
        if(err) {
            fs.close(fd);
            throw err;
            return false;
        }
        fs.write(fd,'万岁！',(err,bytes,str)=>{
            if(err) {
                fs.close(fd);
                throw err;
                return false;
            }
            console.log('写入成功，共写入'+bytes +'字节。');
            fs.close(fd);
            fs.unlink('./temo.txt',err=>{
                if(err) throw err;
                console.log('删除文件成功');
            })
        });
    });
}catch(error){
    console.log(error);
}
